First see instructions in post 1, then try the following if that doesn't work...
Try a clean install of the Rom again, when the Rom boots (where you select your language, reboot into recovery and flash theme. Then when it reboots, setup your phone. That should fix the playstore and when you uninstall gmail update it should be themed..
Another way you can try, untick auto update in playstore settings, then use something like root explorer and delete gmail.apk and phonesky.apk from system/app, then reflash theme
Let me know if that fixes it, its a pain because google keeps updating their apps